Demonic Freedom - DxD x Sister New Devil

What if Mio had a blood-related older brother, and they lived in the world where both of Highschool DxD and Testament Of Sister New devil plots is occurring? Well, this is a story about it. Kazuki Naruse is the first son of the Demon King, Wilbert, who separated himself from the other original Devil Kings during the time of the Great War, and took his followers with him, and created a separate race: Demons. Now that his father is dead, Kazuki finally has the freedom to do whatever he wants, and he's going to have as much as fun as he can before his freedom will get stolen again. This story will revolve around both plots of Highschool DxD and Testament Of Sister New Devil, but there will be also characters from other shows. I don't own anything but my OC.